Several vulnerabilities have been discovered in the Linux kernel thatmay lead to a denial of service or privilege escalation. The CommonVulnerabilities and Exposures project identifies the following problems:

CVE-2009-4895

Kyle Bader reported an issue in the tty subsystem that allows local users to create a denial of service (NULL pointer dereference).

CVE-2010-2226

Dan Rosenberg reported an issue in the xfs filesystem that allows local users to copy and read a file owned by another user, for which they only have write permissions, due to a lack of permission checking in the XFS_SWAPEXT ioctl.

CVE-2010-2240

Rafal Wojtczuk reported an issue that allows users to obtain escalated privileges. Users must already have sufficient privileges to execute or connect clients to an Xorg server.

CVE-2010-2248

Suresh Jayaraman discovered an issue in the CIFS filesystem. A malicious file server can set an incorrect "CountHigh" value, resulting in a denial of service (BUG_ON() assertion).

CVE-2010-2521

Neil Brown reported an issue in the NFSv4 server code. A malicious client could trigger a denial of service (Oops) on a server due to a bug in the read_buf() routine.

CVE-2010-2798

Bob Peterson reported an issue in the GFS2 file system. A file system user could cause a denial of service (Oops) via certain rename operations.

CVE-2010-2803

Kees Cook reported an issue in the DRM (Direct Rendering Manager) subsystem. Local users with sufficient privileges (local X users or members of the 'video' group on a default Debian install) could acquire access to sensitive kernel memory.

CVE-2010-2959

Ben Hawkes discovered an issue in the AF_CAN socket family. An integer overflow condition may allow local users to obtain elevated privileges.

CVE-2010-3015

Toshiyuki Okajima reported an issue in the ext4 filesystem. Local users could trigger a denial of service (BUG assertion) by generating a specific set of filesystem operations.

This update also includes fixes a regression introduced by a previousupdate. See the referenced Debian bug page for details.

For the stable distribution (lenny), this problem has been fixed inversion 2.6.26-24lenny1.

We recommend that you upgrade your linux-2.6 and user-mode-linuxpackages.

The following matrix lists additional source packages that wererebuilt for compatibility with or to take advantage of this update:

Debian 5.0 (lenny) user-mode-linux 2.6.26-1um-2+24lenny1

Upgrade instructions- --------------------

wget url will fetch the file for youdpkg -i file.deb will install the referenced file.

If you are using the apt-get package manager, use the line forsources.list as given below: